I mentioned ifttt last year: it's a web automation tool that lets you
glue different web services together. I used it to build a 6music bot
this year which was very well received.

I also use it to back up my own twitter interactions. All of my tweets and
mentions are emailed to me. I can then archive those mails with the rest of
my mail.

I wrote a small python script to clean up the mails that ifttt spits out.
The resulting mails are now only about twice as large as the maximum length
of a tweet, rather than orders of magnitude larger. I've published it here:
twitter.